第二相对挤压态Mg−Zn−Er合金织构及力学性能的影响

摘要

研究不同的第二相对Mg?Zn?Er 合金的织构及力学性能的影响.结果表明,准晶I相通过引起不连续动态再结晶机制(DDRX)而形成大量的等轴晶,进而弱化织构;而W相则通过连续动态再结晶机制(CDRX)对细化晶粒起到很重要的作用,且具有较高的织构强度.因此,含有I相的Mg?6Zn?1Er 合金具有较高伸长率,为20.4%;而含有W相的Mg?2Zn?2Er合金则表现了更好的强度,其屈服强度(YS)约为247 MPa.%The effects of kinds of secondary phases on texture and mechanical properties of Mg?Zn?Er alloys were investigated. The results suggest that the I-phase has a great effect on modification of the texture via the discontinuous dynamic recrystallization mechanism (DDRX), which tends to form well-developed equiaxed recrystallized grains. Meanwhile, the W-phase plays an important role in refining the grain size via continuous dynamic recrystallization (CDRX), companied with a higher maximum texture intensity. Thus, the Mg?6Zn?1Er alloy containing I-phase shows a performance of higher elongation of 20.4%. The Mg?2Zn?2Er alloy including W-phase displays a better tensile strength, and the yield strength (YS) is about 247 MPa.